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/************************************************************************/
/*                                                                      */
/*    File:           symboltable.c                                     */
/*                                                                      */
/*    Author:         B. Rohde                                          */
/*                                                                      */
/*    History:        02-AUG-89       Creation of file                  */
/*                                                                      */
/*                    04-Jan-93       Added function prototypes.        */
/*                                                                      */
/*    Purpose:        Implemets the services for searching symbol       */
/*                    tables                                            */
/*                                                                      */
/*    Functions:      StringToId()                                      */
/*                    IdToString()                                      */
/*                                                                      */
/************************************************************************/

#include "symboltable.h"

#include <stdlib.h>
#include <string.h>

#include "local.h"

int StringToId(symbol_entry_t table[], char *string)
/*
 * Searches a symbol table for entries with the character string of the
 * second parameter and returns the corresponding id-number.
 * If the string is not found, the function returns the id of the sentinel
 * NULL symbol expected to terminate the table.
 */
{
   for (;!IsNULL(table->symbol_string); table++)
      if (0 == strcmp(table->symbol_string, string)) break;
   
   return (table->symbol_id);
}

char *IdToString(symbol_entry_t table[], int id)
/*
 * Searches a symbol table for entries with the id-number of the
 * second parameter and returns the corresponding symbol string.
 * If the id-number is not found, the function returns (char *)NULL.
 */
{
   for (;!IsNULL(table->symbol_string); table++)
      if (table->symbol_id == id) return (table->symbol_string);
   return ((char *)NULL);
}
